IEVref: | 731-03-53 | ID: | |

Language: | en | Status: Standard | |

Term: | bound mode | ||

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Definition: | in an optical fibre, a mode whose field decays monotonically in the transverse direction everywhere external to the core and which does not lose power to radiation
NOTE 1 – Where the refractive index decreases with distance from the axis and where there is no central refractive index dip a bound mode is one for which :
where NOTE 2 – Bound modes correspond to guided light rays in the terminology of geometric optics. NOTE 3 – In a multimode fibre, the power in bound modes is predominantly contained in the core of the fibre. | ||

Publication date: | 1991-10 | ||

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Internal notes: | 2011-09-16: Corrected by. JGO | ||

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where *β* is the imaginary part (phase coefficient) of the axial propagation coefficient,

*n*(*a*) is the refractive index at *r* = *a*, the radius,

*n*(0) is the refractive index at *r* = 0,

*k* is the angular free space wavenumber 2 π/λ and λ is the wavelength.